冲击+扰流柱双层壁冷却结构的强化换热性能及流阻特性  

Enhanced heat transfer performance and flow resistance characteristics of the double-wall cooling structures with jet impingement and pin fins

作　　者：韦宏 祖迎庆 WEI Hong;ZU Yingqing(School of Mechanical Engineering,Anhui Polytechnic University,Wuhu Anhui 241000,China;Department of Aeronautics and Astronautics,Fudan University,Shanghai 200433,China)

机构地区：[1]安徽工程大学机械工程学院,安徽芜湖241000 [2]复旦大学航空航天系,上海200433

出　　处：《航空动力学报》2024年第8期13-26,共14页Journal of Aerospace Power

基　　金：上海市自然科学基金(19ZR1402500);上海市商用航空发动机领域联合创新计划(AR908,AR960)。

摘　　要：对于冲击+扰流柱的双层壁冷却结构,为了研究冲击孔的无量纲排间距和无量纲孔间距、扰流柱的无量纲直径以及冲击射流雷诺数对其强化换热性能以及其流阻特性的影响,基于多种几何参数和流动参数对冲击+扰流柱的双层壁冷却结构进行了实验研究,并根据实验工况开展了相应的数值模拟。结果表明:在带有扰流柱的整个冲击靶板内表面上,面平均努塞尔数随着射流雷诺数的增大而单调增大,且基本上呈现为线性增长的趋势。总体而言,在扰流柱表面的面平均努塞尔数略高于冲击靶板内壁面的面平均努塞尔数。随着扰流柱的无量纲直径的增大,在双层壁冷却结构的整个内表面的面平均努塞尔数呈现为先下降后增大的趋势。此外,在整个内表面的面平均努塞尔数随着冲击孔的无量纲排间距的增大而减小;但是,面平均努塞尔数对无量纲孔间距变化的响应不敏感。对于冲击+扰流柱双层壁冷却结构的流量系数,它随着射流雷诺数以及冲击孔的无量纲排间距和无量纲孔间距的增大而增大,但是随着扰流柱的无量纲直径的增大而减小。For the double-wall cooling structure with jet impingement holes and pin fins,in order to study the influences of non-dimansional row spacing and dimensionless hole pitch of the jet impingement holes,the dimensionless diameter of pin fins and the jet impingement Reynolds number on the enhanced heat transfer performance and flow resistance characteristics,experimental studies were conducted based on various geometrical and flow parameters in present study.In addition,the corresponding numerical simulations were also carried out according to the experimental conditions.The results showed that on the whole internal wall surface of the jet impingement target plate with pin fins,the area-averaged Nusselt number monotonically increased with the increase of the jet impingement Reynolds number,and basically presented a linearly increasing tendency.In general,the area-averaged Nusselt number of the wall surface of pin fins was slightly higher than that on the internal wall surface of the jet impingement target plate.With the increase of dimensionless diameter of pin fins,the area-averaged Nusselt number of the entire internal wall surface of the double-wall cooling structure decreased firstly and then increased.In addition,the area-averaged Nusselt number of the entire internal wall surface decreased with the increase of nondimensionla row spacing.However,the area-averaged Nusselt number of the entire internal wall surface was not sensitive to the variation of non-dimensional hole pitch.The discharge coefficient of the doublewall cooling structure with jet impingement holes and pin fins increased with the increase of the jet impingement Reynolds number,the dimensionless row spacing and non-dimansional hole pitch of jet impingement holes,but decreased with the increase of dimensionless diameter of pin fins.

关 键 词：双层壁冷却结构 冲击射流 扰流柱 强化换热 努塞尔数 流量系数 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]